What technology does netfilter.org use?

netfilter.org is built with Apache.

Is netfilter.org secure (HTTPS)?

Yes. netfilter.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 26, 2026.

Who hosts netfilter.org?

Hosting provider information for netfilter.org is not available yet.

What is netfilter.org's SEO score?

netfilter.org scored 55/100 for SEO in the latest analysis (fair).

What is netfilter.org's overall website score?

netfilter.org has an overall SiteGraph score of 77/100, combining SEO, performance, security, and accessibility.

Has netfilter.org's score changed over time?

netfilter.org's overall score has stayed steady at 77/100 since Jul 26, 2026.

netfilter.org

netfilter/iptables project homepage - The netfilter.org project

Last scanned Aug 3, 2026, 3:00 AM · 7 views

Overall score

Fair

Summary

This website uses Apache. SEO is fair (55/100) and accessibility is excellent (95/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.

Top issues to fix

13 issues found · 4 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing meta description
SEO
Add a ~150-character meta description to control your search-result snippet and lift click-through rate.
Missing viewport meta tag
Accessibility
Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

+7 more issues — details in the sections below.

SEO

7 issue(s) found

100

Performance

121 ms

Security

HTTPS & header checks

Accessibility

1 issue(s) found

Score history

0 overall since Jul 26, 2026

Overall: 77
SEO: 55
Security: 65
Performance: 100
Accessibility: 95

Contact

Email, phone, and address published on this site's own pages.

Email: webmaster@netfilter.org

Meta tags

Title: netfilter/iptables project homepage - The netfilter.org project
Description
Canonical
Language: en
Charset: UTF-8
Viewport
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

Apache

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: iptables.org
Valid from: Jun 28, 2026
Valid to: Sep 26, 2026
Days until expiry: 54
SAN domains: conntrack-tools.netfilter.org, ebtables.netfilter.org, ftp.netfilter.org, ipset.netfilter.org, iptables.org, netfilter.org, nftables.org, workshop.netfilter.org, www.iptables.org, www.netfilter.org, www.nftables.org

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 5 · H3 0

Links

86 internal · 8 external · 20 broken

Images

1 total · 0 missing alt

Scripts / Styles

0 scripts · 1 stylesheets

JS / CSS size

0 B · 0 B

Page size

23.2 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Title longer than 60 characters
Missing meta description
Missing canonical link
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://netfilter.org
Final URL: https://netfilter.org
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 121 ms
HTML size: 23.2 KB
Redirect chain: https://netfilter.org

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does netfilter.org use?: netfilter.org is built with Apache.
Is netfilter.org secure (HTTPS)?: Yes. netfilter.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 26, 2026.
Who hosts netfilter.org?: Hosting provider information for netfilter.org is not available yet.
What is netfilter.org's SEO score?: netfilter.org scored 55/100 for SEO in the latest analysis (fair).
What is netfilter.org's overall website score?: netfilter.org has an overall SiteGraph score of 77/100, combining SEO, performance, security, and accessibility.
Has netfilter.org's score changed over time?: netfilter.org's overall score has stayed steady at 77/100 since Jul 26, 2026.